A larger than expected opening fall on Wall Street has pushed London shares into the red again, on what is proving to be another topsy turvy day for the market.

US financial shares led the way down, as investors started to worry again about more repercussions from the credit crunch after JP Morgan wrote down another $1.5bn on its mortgage backed assets.

And despite the statements about Russia ending its involvement in Georgia, fighting still seems to be continuing, pushing the oil price higher once more.

So the Dow Jones Industrial Average is down around 65 points, with the FTSE 100 now 5.9 points lower at 5535.9.

Information group Thomson Reuters released disappointing results just after lunch, leaving its shares 69p lower at £14.69. On the other hand, pumps and valves group Weir unveiled half-year figures showing a doubling of profits - only to see its shares lose 58.5p to 844.5p on profit taking.

Bad news from technology group Psion sent its shares tumbling 6% to 85p. The company said it was investigating claims worth a total of £10m against its Japanese subsidiary. The claims come from some of its trading partners and relate to unpaid purchases and a guarantee of a third party's trading obligations. Psion has denied liability, and has made no provision for the claims.